Not all the locations are dog friendly...

the Greenville location has the best patio, though, and the nicest staff (the downtown and Plano locations do not have patios and hence do not allow dogs). Service is mediocre on the patio at the Central Expressway location. As of September 2008, the Greenville Ave location has gone to 7am-3PM only from Monday-Thursday, though, so you can't get dinner there. :(
The food is GREAT - we highly recommend the crepes, but our favorite things are the queso and their grilled cheese sandwich with asiago and feta!

Cafe Brazil

This is the place I go when i want to go out with my pet and still get something to eat. GREAT FOOD and COFFEE!! They will also give water to your pup. Dogs must stay on patio. My dog loves to go there with me in the summers.